On 30/01/2011 14:09, Yigit Turgut wrote:
> mHz ?
>

millihertz

> On Sun, Jan 30, 2011 at 3:59 PM, Olin Lathrop<olin_piclist@embedinc.com>w=
rote:
>
>> V G wrote:
>>> Schematic: http://img411.imageshack.us/img411/997/schematic1.png
>>>
>>> The AD620 functions as the differential amplifier and outputs a
>>> signal into the middle section which acts as a low pass and high pass
>>> filter.
>> It does, but at the wrong frequencies.  Your low pass is a 110mHz, and t=
he
>> high pass at 50mHz.  I would make the total impedence lower.  The input
>> impedence of the LM324 is not so great.  It would also flip the order of
>> the
>> two filters, then have the low pass resistor be about 10x the high pass
>> resistor, which caps sized to suite.
>>
>>
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